<table>
	<tr>
		<td>Категории</td>
		<td>
			<select name="block[Properties][category]">
				<option value="0">- Все -</option>
				{foreach $categories as $category}
					{foreach $category->SubCategories as $subCategory}
						<option value="{$subCategory->id}">{$category->title} - {$subCategory->title}</option>
					{/foreach}
				{/foreach}
			</select>
		</td>
	</tr>
</table>